Based on the CJ267-91,the text studies the effect of solvent,the preparation of the normative sample and the wave-length upon the result of mensurating mineral oils, so that it′s possible to choose the suitable condition to improve the accuracy of the mensurating results.

Determination of the Best Wavelength and Regression Equation of Ultra - Violet Spectrophotometer of 10 - Hy- droxy- Decenoic Acid (10 - HDA) in Pure Royal Jelly;

Influence of laser wavelength on depth of photoacoustic imaging;

Effect of rail irregularity wavelength on lateral runningcomfort of speed-raised train;

This paper presents the principle,formula derivation and detailed operation of an improved method for determining the asphaltene content through measuring the absorption degree of the sample suspension under incident beam of wave lengths of 750 nm and 800 nm.

The paper presents a mehtod for determining the wavelength of shallow water waves by using the wave dispersion equation and the influence of water depth,water flow, and wave amplitude upon the wave lengt

Thestandard optical pyrometer of this pyrometers is the standard instrument used at thehigh temperature zone of the international practical temperation scale,But wanting to have the meas-ured temperature,the value of the effective wave length must be determined.

Absorbency at wavelength 510 nm and 390 nm were determined respectively with double-wavelength spectrophotometry,then iron and titanium in sample solution were detected.

Methods:According to UV spectral properties of 2-MN and 2-MNQ in anhydrous alcohol, the equivalence absorbency double-wavelength UV spectrophotometry was adopted, and 275.

A double-wavelength spectrophotometry was used to determine the Co~(2+) and Ni~(2+) content in nickel-cobalt alloy electrolyte simultaneously,using PAR-ethanol solution as developer.